Link Adaptation for Mitigating Earth-to-Space Propagation Effects on the NASA SCaN Testbed

In Earth-to-Space communications, well-known propagation effects such as path loss and atmospheric loss can lead to fluctuations in the strength of the communications link between a satellite and its ground station. Additionally, a less-often considered effect of shadowing due to the geometry of the...

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Main Author:	Kilcoyne, Deirdre Kathleen
Other Authors:	Electrical and Computer Engineering
Format:	Others
Published:	Virginia Tech 2016
Subjects:	link adaptation adaptive modulation shadowing error vector magnitude
Online Access:	http://hdl.handle.net/10919/71362

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spelling	ndltd-VTETD-oai-vtechworks.lib.vt.edu-10919-713622020-11-25T05:37:42Z Link Adaptation for Mitigating Earth-to-Space Propagation Effects on the NASA SCaN Testbed Kilcoyne, Deirdre Kathleen Electrical and Computer Engineering McGwier, Robert W. Buehrer, R. Michael Beex, Aloysius A. Headley, William C. link adaptation adaptive modulation shadowing error vector magnitude In Earth-to-Space communications, well-known propagation effects such as path loss and atmospheric loss can lead to fluctuations in the strength of the communications link between a satellite and its ground station. Additionally, a less-often considered effect of shadowing due to the geometry of the satellite and its solar panels can also lead to link degradation. As a result of these anticipated channel impairments, NASA's communication links have been traditionally designed to handle the worst-case impact of these effects through high link margins and static, lower rate, modulation formats. This thesis first characterizes the propagation environment experienced by a software-defined radio on the NASA SCaN Testbed through a full link-budget analysis. Then, the following chapters propose, design, and model a link adaptation algorithm to provide an improved trade-off between data rate and link margin through varying the modulation format as the received signal-to-noise ratio fluctuates. Master of Science 2016-06-16T08:00:12Z 2016-06-16T08:00:12Z 2016-06-15 Thesis vt_gsexam:7604 http://hdl.handle.net/10919/71362 In Copyright http://rightsstatements.org/vocab/InC/1.0/ ETD application/pdf Virginia Tech
collection	NDLTD
format	Others
sources	NDLTD
topic	link adaptation adaptive modulation shadowing error vector magnitude
spellingShingle	link adaptation adaptive modulation shadowing error vector magnitude Kilcoyne, Deirdre Kathleen Link Adaptation for Mitigating Earth-to-Space Propagation Effects on the NASA SCaN Testbed
description	In Earth-to-Space communications, well-known propagation effects such as path loss and atmospheric loss can lead to fluctuations in the strength of the communications link between a satellite and its ground station. Additionally, a less-often considered effect of shadowing due to the geometry of the satellite and its solar panels can also lead to link degradation. As a result of these anticipated channel impairments, NASA's communication links have been traditionally designed to handle the worst-case impact of these effects through high link margins and static, lower rate, modulation formats. This thesis first characterizes the propagation environment experienced by a software-defined radio on the NASA SCaN Testbed through a full link-budget analysis. Then, the following chapters propose, design, and model a link adaptation algorithm to provide an improved trade-off between data rate and link margin through varying the modulation format as the received signal-to-noise ratio fluctuates. === Master of Science
author2	Electrical and Computer Engineering
author_facet	Electrical and Computer Engineering Kilcoyne, Deirdre Kathleen
author	Kilcoyne, Deirdre Kathleen
author_sort	Kilcoyne, Deirdre Kathleen
title	Link Adaptation for Mitigating Earth-to-Space Propagation Effects on the NASA SCaN Testbed
title_short	Link Adaptation for Mitigating Earth-to-Space Propagation Effects on the NASA SCaN Testbed
title_full	Link Adaptation for Mitigating Earth-to-Space Propagation Effects on the NASA SCaN Testbed
title_fullStr	Link Adaptation for Mitigating Earth-to-Space Propagation Effects on the NASA SCaN Testbed
title_full_unstemmed	Link Adaptation for Mitigating Earth-to-Space Propagation Effects on the NASA SCaN Testbed
title_sort	link adaptation for mitigating earth-to-space propagation effects on the nasa scan testbed
publisher	Virginia Tech
publishDate	2016
url	http://hdl.handle.net/10919/71362
work_keys_str_mv	AT kilcoynedeirdrekathleen linkadaptationformitigatingearthtospacepropagationeffectsonthenasascantestbed
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Link Adaptation for Mitigating Earth-to-Space Propagation Effects on the NASA SCaN Testbed

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